Why Vecna Looks So Different In Stranger Things Season 5

In Season 4, the scourge of the Upside Down resembles a man without skin. In Season 5, he looks more like a mean version of Groot. What's the deal?

In Season 4, the scourge of the Upside Down resembles a man without skin. In Season 5, he looks more like a mean version of Groot. What's the deal?